3National Committee for Clinical Laboratory Standards. Performance standards for antimicrobial disk susceptibility tests. Approved standard M100-S10. Pennsylvania: NCCLS, 2000, 32-34.
4Chylak J, Cybulski Z, Tulecka T. Haemophilus isolates in children suffering from chronic upper respiratory tract infections[J]. Przegl Epidemiol, 1995, 49(1-2): 23-28.
5Falck G, Engstrand I, Gad A, et al. Laurila A Demonstration of Chlamydia pneumoniae in patients with chronic pharyngitis[J]. Scand J Infect Dis, 1997, 29(6): 585-589.
6Tinkelman DG, Silk HJ. Clinical and bacteriologic features of chronic sinusitis in children[J]. Am J Dis Child, 1989, 143(8): 938-941.
